On-chip tunable photonic delay line

Ji, Xingchen; Yao, Xinwen; Gan, Yu; Mohanty, Aseema; Tadayon, Mohammad Amin; Hendon, Christine P.; Lipson, Michal

doi:10.1063/1.5111164

Cited by 49 publications

(27 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While tight optical confinement can reduce the footprint, losses approaching even 1 dB m −1 have not been achieved in any nonlinear waveguide including thick-core Si 3 N 4 . Here, we demonstrate meter-long Si 3 N 4 waveguides featuring ultralow loss and small footprint, which can enable key applications such as traveling-wave parametric amplifiers 56 – 59 , rare-earth-doped mode-locked lasers 60 and optical coherence tomography (OCT) 75 .…”

Section: Resultsmentioning

confidence: 99%

High-yield, wafer-scale fabrication of ultralow-loss, dispersion-engineered silicon nitride photonic circuits

et al. 2021

View full text Add to dashboard Cite

Low-loss photonic integrated circuits and microresonators have enabled a wide range of applications, such as narrow-linewidth lasers and chip-scale frequency combs. To translate these into a widespread technology, attaining ultralow optical losses with established foundry manufacturing is critical. Recent advances in integrated Si3N4 photonics have shown that ultralow-loss, dispersion-engineered microresonators with quality factors Q > 10 × 106 can be attained at die-level throughput. Yet, current fabrication techniques do not have sufficiently high yield and performance for existing and emerging applications, such as integrated travelling-wave parametric amplifiers that require meter-long photonic circuits. Here we demonstrate a fabrication technology that meets all requirements on wafer-level yield, performance and length scale. Photonic microresonators with a mean Q factor exceeding 30 × 106, corresponding to 1.0 dB m−1 optical loss, are obtained over full 4-inch wafers, as determined from a statistical analysis of tens of thousands of optical resonances, and confirmed via cavity ringdown with 19 ns photon storage time. The process operates over large areas with high yield, enabling 1-meter-long spiral waveguides with 2.4 dB m−1 loss in dies of only 5 × 5 mm2 size. Using a response measurement self-calibrated via the Kerr nonlinearity, we reveal that the intrinsic absorption-limited Q factor of our Si3N4 microresonators can exceed 2 × 108. This absorption loss is sufficiently low such that the Kerr nonlinearity dominates the microresonator’s response even in the audio frequency band. Transferring this Si3N4 technology to commercial foundries can significantly improve the performance and capabilities of integrated photonics.

show abstract

Section: Resultsmentioning

confidence: 99%

High-yield, wafer-scale fabrication of ultralow-loss, dispersion-engineered silicon nitride photonic circuits

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The propagation loss for a single mode waveguide with similar fabrication process can also be found in ref. [27].…”

Section: Resultsmentioning

confidence: 99%

Exploiting Ultralow Loss Multimode Waveguides for Broadband Frequency Combs

Jang

Dave

et al. 2020

Laser & Photonics Reviews

Self Cite

View full text Add to dashboard Cite

Low propagation loss in high confinement waveguides is critical for chip-based nonlinear photonics applications. Sophisticated fabrication processes which yield sub-nm roughness are generally needed to reduce scattering points at the waveguide interfaces in order to achieve ultralow propagation loss. Here, we show ultralow propagation loss by shaping the mode using a highly multimode structure to reduce its overlap with the waveguide interfaces, thus relaxing the fabrication processing requirements. Microresonators with intrinsic quality factors (Q) of 31.8 ± 4.4 million are experimentally demonstrated. Although the microresonators support 10 transverse modes only the fundamental mode is excited and no higher order modes are observed when using nonlinear adiabatic bends. A record-low threshold pump power of 73 µW for parametric oscillation is measured and a broadband, almost octave spanning single-soliton frequency comb without any signatures of higher order modes in the spectrum spanning from 1097 nm to 2040 nm (126 THz) is generated in the multimode microresonator. This work provides a design method that could be applied to different material platforms to achieve and use ultrahigh-Q multimode microresonators.

show abstract

“…If we utilize the whole available bandwidth, B = N Δ f , then the speed is For a modulation bandwidth of 100 GHz and an FSR of 100 MHz (such that N = 1000), this yields a speed C = 10 14 MACs per second or 100 TMAC per second, which is comparable with MZI meshes 5 , 51 , 52 . Although achieving such small FSRs on chip is challenging, recent progress in integrating low-loss delay lines on chip 53 , 54 holds promise, since meter-scale delays were reported in an 8 mm 2 footprint using spiral resonators, corresponding to an equivalent FSR of ~350 MHz 53 . These design techniques can be extended to lithium niobate rings with high modulation bandwidths 14 , 46 .…”

Section: Discussionmentioning

confidence: 99%

Arbitrary linear transformations for photons in the frequency synthetic dimension

et al. 2021

View full text Add to dashboard Cite

Arbitrary linear transformations are of crucial importance in a plethora of photonic applications spanning classical signal processing, communication systems, quantum information processing and machine learning. Here, we present a photonic architecture to achieve arbitrary linear transformations by harnessing the synthetic frequency dimension of photons. Our structure consists of dynamically modulated micro-ring resonators that implement tunable couplings between multiple frequency modes carried by a single waveguide. By inverse design of these short- and long-range couplings using automatic differentiation, we realize arbitrary scattering matrices in synthetic space between the input and output frequency modes with near-unity fidelity and favorable scaling. We show that the same physical structure can be reconfigured to implement a wide variety of manipulations including single-frequency conversion, nonreciprocal frequency translations, and unitary as well as non-unitary transformations. Our approach enables compact, scalable and reconfigurable integrated photonic architectures to achieve arbitrary linear transformations in both the classical and quantum domains using current state-of-the-art technology.

show abstract

On-chip tunable photonic delay line

Cited by 49 publications

References 30 publications

High-yield, wafer-scale fabrication of ultralow-loss, dispersion-engineered silicon nitride photonic circuits

High-yield, wafer-scale fabrication of ultralow-loss, dispersion-engineered silicon nitride photonic circuits

Exploiting Ultralow Loss Multimode Waveguides for Broadband Frequency Combs

Arbitrary linear transformations for photons in the frequency synthetic dimension

Contact Info

Product

Resources

About